The interviewer didn't show up twice to the scheduled time. Second time he told me that his phone was broken. (I had taken two days off from work). Third time the codepad stopped showing me the shared screen in hackerrank which wasted first 5 minutes of the interview.

The voice quality was super bad and It was hard to hear him. It was hard to understand him because he was eating up the end of each word. I didn't ask him to repeat himself too many times because it would have been construed as rude while I was asking him questions.

He asked me a question I already knew. The question was easily solvable and I was able to solve the question within the time and the interviewer was happy with the solution. Two days later I received an email stating that I was rejected and i need to work on my "fluency in data structures and Algorithms".

I have solved that particular question on leetcode more than I can count and it is one of the easiest medium level problem.